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Test Shackles.

379

to the specimen t>, held in place by a slightly conical ring c.
Compression shackles are shewn at Fig. 338. , AX and BX are to take
small specimens in a tension machine, and the arrangement at q

is for admission of large specimens in a compression machine.
The specimen at AX is placed at c, and the plunger d guided
within a cylinder. As one shackle a slides within the other

DD